// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/power_monitor/power_monitor.h"

#include <utility>

#include "base/power_monitor/power_monitor_source.h"

namespace base {

static PowerMonitor* g_power_monitor = NULL;

PowerMonitor::PowerMonitor(std::unique_ptr<PowerMonitorSource> source)
    : observers_(new ObserverListThreadSafe<PowerObserver>())
    , source_(std::move(source))
{
    DCHECK(!g_power_monitor);
    g_power_monitor = this;
}

PowerMonitor::~PowerMonitor()
{
    DCHECK_EQ(this, g_power_monitor);
    g_power_monitor = NULL;
}

// static
PowerMonitor* PowerMonitor::Get()
{
    return g_power_monitor;
}

void PowerMonitor::AddObserver(PowerObserver* obs)
{
    observers_->AddObserver(obs);
}

void PowerMonitor::RemoveObserver(PowerObserver* obs)
{
    observers_->RemoveObserver(obs);
}

PowerMonitorSource* PowerMonitor::Source()
{
    return source_.get();
}

bool PowerMonitor::IsOnBatteryPower()
{
    return source_->IsOnBatteryPower();
}

void PowerMonitor::NotifyPowerStateChange(bool battery_in_use)
{
    DVLOG(1) << "PowerStateChange: " << (battery_in_use ? "On" : "Off")
             << " battery";
    observers_->Notify(FROM_HERE, &PowerObserver::OnPowerStateChange,
        battery_in_use);
}

void PowerMonitor::NotifySuspend()
{
    DVLOG(1) << "Power Suspending";
    observers_->Notify(FROM_HERE, &PowerObserver::OnSuspend);
}

void PowerMonitor::NotifyResume()
{
    DVLOG(1) << "Power Resuming";
    observers_->Notify(FROM_HERE, &PowerObserver::OnResume);
}

} // namespace base
